1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2007-2009 Google Inc. and Amit Singh
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are
9 * met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following disclaimer
15 * in the documentation and/or other materials provided with the
16 * distribution.
17 * * Neither the name of Google Inc. nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 *
33 * Copyright (C) 2005 Csaba Henk.
34 * All rights reserved.
35 *
36 * Copyright (c) 2019 The FreeBSD Foundation
37 *
38 * Portions of this software were developed by BFF Storage Systems, LLC under
39 * sponsorship from the FreeBSD Foundation.
40 *
41 * Redistribution and use in source and binary forms, with or without
42 * modification, are permitted provided that the following conditions
43 * are met:
44 * 1. Redistributions of source code must retain the above copyright
45 * notice, this list of conditions and the following disclaimer.
46 * 2. Redistributions in binary form must reproduce the above copyright
47 * notice, this list of conditions and the following disclaimer in the
48 * documentation and/or other materials provided with the distribution.
49 *
50 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 */
62
63 #include <sys/param.h>
64 #include <sys/buf.h>
65 #include <sys/module.h>
66 #include <sys/systm.h>
67 #include <sys/errno.h>
68 #include <sys/kernel.h>
69 #include <sys/capsicum.h>
70 #include <sys/conf.h>
71 #include <sys/filedesc.h>
72 #include <sys/uio.h>
73 #include <sys/malloc.h>
74 #include <sys/queue.h>
75 #include <sys/lock.h>
76 #include <sys/sx.h>
77 #include <sys/mutex.h>
78 #include <sys/proc.h>
79 #include <sys/vnode.h>
80 #include <sys/namei.h>
81 #include <sys/mount.h>
82 #include <sys/sysctl.h>
83 #include <sys/fcntl.h>
84 #define EXTERR_CATEGORY EXTERR_CAT_FUSE_VFS
85 #include <sys/exterrvar.h>
86
87 #include "fuse.h"
88 #include "fuse_node.h"
89 #include "fuse_ipc.h"
90 #include "fuse_internal.h"
91
92 #include <sys/priv.h>
93 #include <security/mac/mac_framework.h>
94
95 SDT_PROVIDER_DECLARE(fusefs);
96 /*
97 * Fuse trace probe:
98 * arg0: verbosity. Higher numbers give more verbose messages
99 * arg1: Textual message
100 */
101 SDT_PROBE_DEFINE2(fusefs, , vfsops, trace, "int", "char*");
102
103 /* This will do for privilege types for now */
104 #ifndef PRIV_VFS_FUSE_ALLOWOTHER
105 #define PRIV_VFS_FUSE_ALLOWOTHER PRIV_VFS_MOUNT_NONUSER
106 #endif
107 #ifndef PRIV_VFS_FUSE_MOUNT_NONUSER
108 #define PRIV_VFS_FUSE_MOUNT_NONUSER PRIV_VFS_MOUNT_NONUSER
109 #endif
110 #ifndef PRIV_VFS_FUSE_SYNC_UNMOUNT
111 #define PRIV_VFS_FUSE_SYNC_UNMOUNT PRIV_VFS_MOUNT_NONUSER
112 #endif
113
114 static vfs_fhtovp_t fuse_vfsop_fhtovp;
115 static vfs_mount_t fuse_vfsop_mount;
116 static vfs_unmount_t fuse_vfsop_unmount;
117 static vfs_root_t fuse_vfsop_root;
118 static vfs_statfs_t fuse_vfsop_statfs;
119 static vfs_vget_t fuse_vfsop_vget;
120
121 struct vfsops fuse_vfsops = {
122 .vfs_fhtovp = fuse_vfsop_fhtovp,
123 .vfs_mount = fuse_vfsop_mount,
124 .vfs_unmount = fuse_vfsop_unmount,
125 .vfs_root = fuse_vfsop_root,
126 .vfs_statfs = fuse_vfsop_statfs,
127 .vfs_vget = fuse_vfsop_vget,
128 };
129
130 static int fuse_enforce_dev_perms = 0;
131
132 SYSCTL_INT(_vfs_fusefs, OID_AUTO, enforce_dev_perms, CTLFLAG_RW,
133 &fuse_enforce_dev_perms, 0,
134 "enforce fuse device permissions for secondary mounts");
135
136 MALLOC_DEFINE(M_FUSEVFS, "fuse_filesystem", "buffer for fuse vfs layer");
137
138 static int
fuse_getdevice(const char * fspec,struct thread * td,struct cdev ** fdevp)139 fuse_getdevice(const char *fspec, struct thread *td, struct cdev **fdevp)
140 {
141 struct nameidata nd, *ndp = &nd;
142 struct vnode *devvp;
143 struct cdev *fdev;
144 int err;
145
146 /*
147 * Not an update, or updating the name: look up the name
148 * and verify that it refers to a sensible disk device.
149 */
150
151 NDINIT(ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, fspec);
152 if ((err = namei(ndp)) != 0)
153 return err;
154 NDFREE_PNBUF(ndp);
155 devvp = ndp->ni_vp;
156
157 if (devvp->v_type != VCHR) {
158 vrele(devvp);
159 return ENXIO;
160 }
161 fdev = devvp->v_rdev;
162 dev_ref(fdev);
163
164 if (fuse_enforce_dev_perms) {
165 /*
166 * Check if mounter can open the fuse device.
167 *
168 * This has significance only if we are doing a secondary mount
169 * which doesn't involve actually opening fuse devices, but we
170 * still want to enforce the permissions of the device (in
171 * order to keep control over the circle of fuse users).
172 *
173 * (In case of primary mounts, we are either the superuser so
174 * we can do anything anyway, or we can mount only if the
175 * device is already opened by us, ie. we are permitted to open
176 * the device.)
177 */
178 #if 0
179 #ifdef MAC
180 err = mac_check_vnode_open(td->td_ucred, devvp, VREAD | VWRITE);
181 if (!err)
182 #endif
183 #endif /* 0 */
184 err = VOP_ACCESS(devvp, VREAD | VWRITE, td->td_ucred, td);
185 if (err) {
186 vrele(devvp);
187 dev_rel(fdev);
188 return err;
189 }
190 }
191 /*
192 * according to coda code, no extra lock is needed --
193 * although in sys/vnode.h this field is marked "v"
194 */
195 vrele(devvp);
196
197 if (!fdev->si_devsw ||
198 strcmp("fuse", fdev->si_devsw->d_name)) {
199 dev_rel(fdev);
200 return ENXIO;
201 }
202 *fdevp = fdev;
203
204 return 0;
205 }
206
207 #define FUSE_FLAGOPT(fnam, fval) do { \
208 vfs_flagopt(opts, #fnam, &mntopts, fval); \
209 vfs_flagopt(opts, "__" #fnam, &__mntopts, fval); \
210 } while (0)
211
212 SDT_PROBE_DEFINE1(fusefs, , vfsops, mntopts, "uint64_t");
213 SDT_PROBE_DEFINE4(fusefs, , vfsops, mount_err, "char*", "struct fuse_data*",
214 "struct mount*", "int");
215
216 static int
fuse_vfs_remount(struct mount * mp,struct thread * td,uint64_t mntopts,uint32_t max_read,int daemon_timeout)217 fuse_vfs_remount(struct mount *mp, struct thread *td, uint64_t mntopts,
218 uint32_t max_read, int daemon_timeout)
219 {
220 int err = 0;
221 struct fuse_data *data = fuse_get_mpdata(mp);
222 /* Don't allow these options to be changed */
223 const static unsigned long long cant_update_opts =
224 MNT_USER; /* Mount owner must be the user running the daemon */
225
226 FUSE_LOCK();
227
228 if ((mp->mnt_flag ^ data->mnt_flag) & cant_update_opts) {
229 err = EOPNOTSUPP;
230 SDT_PROBE4(fusefs, , vfsops, mount_err,
231 "Can't change these mount options during remount",
232 data, mp, err);
233 goto out;
234 }
235 if (((data->dataflags ^ mntopts) & FSESS_MNTOPTS_MASK) ||
236 (data->max_read != max_read) ||
237 (data->daemon_timeout != daemon_timeout)) {
238 // TODO: allow changing options where it makes sense
239 err = EOPNOTSUPP;
240 SDT_PROBE4(fusefs, , vfsops, mount_err,
241 "Can't change fuse mount options during remount",
242 data, mp, err);
243 goto out;
244 }
245
246 if (fdata_get_dead(data)) {
247 err = ENOTCONN;
248 SDT_PROBE4(fusefs, , vfsops, mount_err,
249 "device is dead during mount", data, mp, err);
250 goto out;
251 }
252
253 /* Sanity + permission checks */
254 if (!data->daemoncred)
255 panic("fuse daemon found, but identity unknown");
256 if (mntopts & FSESS_DAEMON_CAN_SPY)
257 err = priv_check(td, PRIV_VFS_FUSE_ALLOWOTHER);
258 if (err == 0 && td->td_ucred->cr_uid != data->daemoncred->cr_uid)
259 /* are we allowed to do the first mount? */
260 err = priv_check(td, PRIV_VFS_FUSE_MOUNT_NONUSER);
261
262 out:
263 FUSE_UNLOCK();
264 return err;
265 }
266
267 static int
fuse_vfsop_fhtovp(struct mount * mp,struct fid * fhp,int flags,struct vnode ** vpp)268 fuse_vfsop_fhtovp(struct mount *mp, struct fid *fhp, int flags,
269 struct vnode **vpp)
270 {
271 struct fuse_fid *ffhp = (struct fuse_fid *)fhp;
272 struct fuse_vnode_data *fvdat;
273 struct vnode *nvp;
274 int error;
275
276 if (!(fuse_get_mpdata(mp)->dataflags & FSESS_EXPORT_SUPPORT))
277 return (EXTERROR(EOPNOTSUPP, "NFS-style lookups are not supported"));
278
279 error = VFS_VGET(mp, ffhp->nid, LK_EXCLUSIVE, &nvp);
280 if (error) {
281 *vpp = NULL;
282 return (error);
283 }
284 fvdat = VTOFUD(nvp);
285 if (fvdat->generation != ffhp->gen ) {
286 vput(nvp);
287 *vpp = NULL;
288 return (ESTALE);
289 }
290 *vpp = nvp;
291 vnode_create_vobject(*vpp, VNODE_NO_SIZE, curthread);
292 return (0);
293 }
294
295 static int
fuse_vfsop_mount(struct mount * mp)296 fuse_vfsop_mount(struct mount *mp)
297 {
298 int err;
299
300 uint64_t mntopts, __mntopts;
301 uint32_t max_read;
302 int linux_errnos;
303 int daemon_timeout;
304 int fd;
305
306 struct cdev *fdev;
307 struct fuse_data *data = NULL;
308 struct thread *td;
309 struct file *fp, *fptmp;
310 char *fspec, *subtype, *fsname = NULL;
311 int fsnamelen;
312 struct vfsoptlist *opts;
313
314 subtype = NULL;
315 max_read = ~0;
316 linux_errnos = 0;
317 err = 0;
318 mntopts = 0;
319 __mntopts = 0;
320 td = curthread;
321
322 /* Get the new options passed to mount */
323 opts = mp->mnt_optnew;
324
325 if (!opts)
326 return (EXTERROR(EINVAL, "Mount options were not supplied"));
327
328 /* `fspath' contains the mount point (eg. /mnt/fuse/sshfs); REQUIRED */
329 if (!vfs_getopts(opts, "fspath", &err))
330 return (EXTERROR(err, "Mount options are missing 'fspath'"));
331
332 /*
333 * With the help of underscored options the mount program
334 * can inform us from the flags it sets by default
335 */
336 FUSE_FLAGOPT(allow_other, FSESS_DAEMON_CAN_SPY);
337 FUSE_FLAGOPT(push_symlinks_in, FSESS_PUSH_SYMLINKS_IN);
338 FUSE_FLAGOPT(default_permissions, FSESS_DEFAULT_PERMISSIONS);
339 FUSE_FLAGOPT(intr, FSESS_INTR);
340 FUSE_FLAGOPT(auto_unmount, FSESS_AUTO_UNMOUNT);
341
342 (void)vfs_scanopt(opts, "max_read=", "%u", &max_read);
343 (void)vfs_scanopt(opts, "linux_errnos", "%d", &linux_errnos);
344 if (vfs_scanopt(opts, "timeout=", "%u", &daemon_timeout) == 1) {
345 if (daemon_timeout < FUSE_MIN_DAEMON_TIMEOUT)
346 daemon_timeout = FUSE_MIN_DAEMON_TIMEOUT;
347 else if (daemon_timeout > FUSE_MAX_DAEMON_TIMEOUT)
348 daemon_timeout = FUSE_MAX_DAEMON_TIMEOUT;
349 } else {
350 daemon_timeout = FUSE_DEFAULT_DAEMON_TIMEOUT;
351 }
352 subtype = vfs_getopts(opts, "subtype=", &err);
353
354 SDT_PROBE1(fusefs, , vfsops, mntopts, mntopts);
355
356 if (mp->mnt_flag & MNT_UPDATE) {
357 return fuse_vfs_remount(mp, td, mntopts, max_read,
358 daemon_timeout);
359 }
360
361 /* `from' contains the device name (eg. /dev/fuse0); REQUIRED */
362 fspec = vfs_getopts(opts, "from", &err);
363 if (!fspec)
364 return (EXTERROR(err, "Mount options are missing 'from'"));
365
366 /* `fd' contains the filedescriptor for this session; REQUIRED */
367 if (vfs_scanopt(opts, "fd", "%d", &fd) != 1)
368 return (EXTERROR(EINVAL, "Mount options contain an invalid value "
369 "for 'fd'"));
370
371 err = fuse_getdevice(fspec, td, &fdev);
372 if (err != 0)
373 return err;
374
375 err = fget(td, fd, &cap_read_rights, &fp);
376 if (err != 0) {
377 SDT_PROBE2(fusefs, , vfsops, trace, 1,
378 "invalid or not opened device");
379 goto out;
380 }
381 fptmp = td->td_fpop;
382 td->td_fpop = fp;
383 err = devfs_get_cdevpriv((void **)&data);
384 td->td_fpop = fptmp;
385 fdrop(fp, td);
386 FUSE_LOCK();
387
388 if (err != 0 || data == NULL) {
389 err = ENXIO;
390 SDT_PROBE4(fusefs, , vfsops, mount_err,
391 "invalid or not opened device", data, mp, err);
392 FUSE_UNLOCK();
393 goto out;
394 }
395 if (fdata_get_dead(data)) {
396 err = ENOTCONN;
397 SDT_PROBE4(fusefs, , vfsops, mount_err,
398 "device is dead during mount", data, mp, err);
399 FUSE_UNLOCK();
400 goto out;
401 }
402 /* Sanity + permission checks */
403 if (!data->daemoncred)
404 panic("fuse daemon found, but identity unknown");
405 if (mntopts & FSESS_DAEMON_CAN_SPY) {
406 err = priv_check(td, PRIV_VFS_FUSE_ALLOWOTHER);
407 EXTERROR(err, "FUSE daemon requires privileges "
408 "due to 'allow_other' option");
409 }
410 if (err == 0 && td->td_ucred->cr_uid != data->daemoncred->cr_uid) {
411 /* are we allowed to do the first mount? */
412 err = priv_check(td, PRIV_VFS_FUSE_MOUNT_NONUSER);
413 EXTERROR(err, "Mounting as a user that is different from the FUSE "
414 "daemon's requires privileges");
415 }
416 if (err) {
417 FUSE_UNLOCK();
418 goto out;
419 }
420 data->ref++;
421 data->mp = mp;
422 data->dataflags |= mntopts;
423 data->max_read = max_read;
424 data->daemon_timeout = daemon_timeout;
425 data->linux_errnos = linux_errnos;
426 data->mnt_flag = mp->mnt_flag & MNT_UPDATEMASK;
427 FUSE_UNLOCK();
428
429 vfs_getnewfsid(mp);
430 MNT_ILOCK(mp);
431 mp->mnt_data = data;
432 /*
433 * FUSE file systems can be either local or remote, but the kernel
434 * can't tell the difference.
435 */
436 mp->mnt_flag &= ~MNT_LOCAL;
437 mp->mnt_kern_flag |= MNTK_USES_BCACHE;
438 /*
439 * Disable nullfs cacheing because it can consume too many resources in
440 * the FUSE server.
441 */
442 mp->mnt_kern_flag |= MNTK_NULL_NOCACHE;
443 MNT_IUNLOCK(mp);
444 /* We need this here as this slot is used by getnewvnode() */
445 mp->mnt_stat.f_iosize = maxbcachebuf;
446 if (subtype) {
447 strlcat(mp->mnt_stat.f_fstypename, ".", MFSNAMELEN);
448 strlcat(mp->mnt_stat.f_fstypename, subtype, MFSNAMELEN);
449 }
450 memset(mp->mnt_stat.f_mntfromname, 0, MNAMELEN);
451 vfs_getopt(opts, "fsname=", (void**)&fsname, &fsnamelen);
452 strlcpy(mp->mnt_stat.f_mntfromname,
453 fsname == NULL ? fspec : fsname, MNAMELEN);
454 mp->mnt_iosize_max = maxphys;
455
456 /* Now handshaking with daemon */
457 fuse_internal_send_init(data, td);
458
459 out:
460 if (err) {
461 FUSE_LOCK();
462 if (data != NULL && data->mp == mp) {
463 /*
464 * Destroy device only if we acquired reference to
465 * it
466 */
467 SDT_PROBE4(fusefs, , vfsops, mount_err,
468 "mount failed, destroy device", data, mp, err);
469 data->mp = NULL;
470 mp->mnt_data = NULL;
471 fdata_trydestroy(data);
472 }
473 FUSE_UNLOCK();
474 dev_rel(fdev);
475 }
476 return err;
477 }
478
479 static int
fuse_vfsop_unmount(struct mount * mp,int mntflags)480 fuse_vfsop_unmount(struct mount *mp, int mntflags)
481 {
482 int err = 0;
483 int flags = 0;
484
485 struct cdev *fdev;
486 struct fuse_data *data;
487 struct fuse_dispatcher fdi;
488 struct thread *td = curthread;
489
490 if (mntflags & MNT_FORCE) {
491 flags |= FORCECLOSE;
492 }
493 data = fuse_get_mpdata(mp);
494 if (!data) {
495 panic("no private data for mount point?");
496 }
497 /* There is 1 extra root vnode reference (mp->mnt_data). */
498 FUSE_LOCK();
499 if (data->vroot != NULL) {
500 struct vnode *vroot = data->vroot;
501
502 data->vroot = NULL;
503 FUSE_UNLOCK();
504 vrele(vroot);
505 } else
506 FUSE_UNLOCK();
507 err = vflush(mp, 0, flags, td);
508 if (err) {
509 return err;
510 }
511 if (fdata_get_dead(data)) {
512 goto alreadydead;
513 }
514 if (fsess_maybe_impl(mp, FUSE_DESTROY)) {
515 fdisp_init(&fdi, 0);
516 fdisp_make(&fdi, FUSE_DESTROY, mp, 0, td, NULL);
517
518 (void)fdisp_wait_answ(&fdi);
519 fdisp_destroy(&fdi);
520 }
521
522 fdata_set_dead(data);
523
524 alreadydead:
525 FUSE_LOCK();
526 data->mp = NULL;
527 fdev = data->fdev;
528 fdata_trydestroy(data);
529 FUSE_UNLOCK();
530
531 MNT_ILOCK(mp);
532 mp->mnt_data = NULL;
533 MNT_IUNLOCK(mp);
534
535 dev_rel(fdev);
536
537 return 0;
538 }
539
540 SDT_PROBE_DEFINE1(fusefs, , vfsops, invalidate_without_export,
541 "struct mount*");
542 static int
fuse_vfsop_vget(struct mount * mp,ino_t ino,int flags,struct vnode ** vpp)543 fuse_vfsop_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp)
544 {
545 struct fuse_data *data = fuse_get_mpdata(mp);
546 uint64_t nodeid = ino;
547 struct thread *td = curthread;
548 struct fuse_dispatcher fdi;
549 struct fuse_entry_out *feo;
550 struct fuse_vnode_data *fvdat;
551 struct timespec now;
552 const char dot[] = ".";
553 __enum_uint8(vtype) vtyp;
554 int error;
555
556 if (!(data->dataflags & FSESS_EXPORT_SUPPORT)) {
557 /*
558 * Unreachable unless you do something stupid, like export a
559 * nullfs mount of a fusefs file system.
560 */
561 SDT_PROBE1(fusefs, , vfsops, invalidate_without_export, mp);
562 return (EXTERROR(EOPNOTSUPP, "NFS-style lookups are not supported"));
563 }
564
565 error = fuse_internal_get_cached_vnode(mp, ino, flags, vpp);
566 if (error || *vpp != NULL)
567 return error;
568
569 getnanouptime(&now);
570
571 /* Do a LOOKUP, using nodeid as the parent and "." as filename */
572 fdisp_init(&fdi, sizeof(dot));
573 fdisp_make(&fdi, FUSE_LOOKUP, mp, nodeid, td, td->td_ucred);
574 memcpy(fdi.indata, dot, sizeof(dot));
575 error = fdisp_wait_answ(&fdi);
576
577 if (error)
578 goto out;
579
580 feo = (struct fuse_entry_out *)fdi.answ;
581
582 if (feo->nodeid == 0) {
583 /* zero nodeid means ENOENT and cache it */
584 error = ENOENT;
585 goto out;
586 }
587
588 if (feo->nodeid != nodeid) {
589 /*
590 * Something is very wrong with the server if "foo/." has a
591 * different inode number than "foo".
592 */
593 static const char exterr[] = "Inconsistent LOOKUP response: "
594 "\"FILE/.\" has a different inode number than \"FILE\".";
595 fuse_warn(data, FSESS_WARN_DOT_LOOKUP, exterr);
596 error = EXTERROR(EIO, exterr);
597 goto out;
598 }
599
600 vtyp = IFTOVT(feo->attr.mode);
601 error = fuse_vnode_get(mp, feo, nodeid, NULL, vpp, NULL, vtyp);
602 if (error)
603 goto out;
604 fvdat = VTOFUD(*vpp);
605
606 if (timespeccmp(&now, &fvdat->last_local_modify, >)) {
607 /*
608 * Attributes from the server are definitely newer than the
609 * last attributes we sent to the server, so cache them.
610 */
611 fuse_internal_cache_attrs(*vpp, &feo->attr, feo->attr_valid,
612 feo->attr_valid_nsec, NULL, true);
613 }
614 fuse_validity_2_bintime(feo->entry_valid, feo->entry_valid_nsec,
615 &fvdat->entry_cache_timeout);
616 out:
617 fdisp_destroy(&fdi);
618 return error;
619 }
620
621 static int
fuse_vfsop_root(struct mount * mp,int lkflags,struct vnode ** vpp)622 fuse_vfsop_root(struct mount *mp, int lkflags, struct vnode **vpp)
623 {
624 struct fuse_data *data = fuse_get_mpdata(mp);
625 int err = 0;
626
627 if (data->vroot != NULL) {
628 err = vget(data->vroot, lkflags);
629 if (err == 0)
630 *vpp = data->vroot;
631 } else {
632 err = fuse_vnode_get(mp, NULL, FUSE_ROOT_ID, NULL, vpp, NULL,
633 VDIR);
634 if (err == 0) {
635 FUSE_LOCK();
636 MPASS(data->vroot == NULL || data->vroot == *vpp);
637 if (data->vroot == NULL) {
638 SDT_PROBE2(fusefs, , vfsops, trace, 1,
639 "new root vnode");
640 data->vroot = *vpp;
641 FUSE_UNLOCK();
642 vref(*vpp);
643 } else if (data->vroot != *vpp) {
644 SDT_PROBE2(fusefs, , vfsops, trace, 1,
645 "root vnode race");
646 FUSE_UNLOCK();
647 vput(*vpp);
648 vrecycle(*vpp);
649 *vpp = data->vroot;
650 } else
651 FUSE_UNLOCK();
652 }
653 }
654 return err;
655 }
656
657 static int
fuse_vfsop_statfs(struct mount * mp,struct statfs * sbp)658 fuse_vfsop_statfs(struct mount *mp, struct statfs *sbp)
659 {
660 struct fuse_dispatcher fdi;
661 int err = 0;
662
663 struct fuse_statfs_out *fsfo;
664 struct fuse_data *data;
665
666 data = fuse_get_mpdata(mp);
667
668 if (!(data->dataflags & FSESS_INITED))
669 goto fake;
670
671 fdisp_init(&fdi, 0);
672 fdisp_make(&fdi, FUSE_STATFS, mp, FUSE_ROOT_ID, NULL, NULL);
673 err = fdisp_wait_answ(&fdi);
674 if (err) {
675 fdisp_destroy(&fdi);
676 if (err == ENOTCONN) {
677 /*
678 * We want to seem a legitimate fs even if the daemon
679 * is stiff dead... (so that, eg., we can still do path
680 * based unmounting after the daemon dies).
681 */
682 goto fake;
683 }
684 return err;
685 }
686 fsfo = fdi.answ;
687
688 sbp->f_blocks = fsfo->st.blocks;
689 sbp->f_bfree = fsfo->st.bfree;
690 sbp->f_bavail = fsfo->st.bavail;
691 sbp->f_files = fsfo->st.files;
692 sbp->f_ffree = fsfo->st.ffree; /* cast from uint64_t to int64_t */
693 sbp->f_namemax = fsfo->st.namelen;
694 sbp->f_bsize = fsfo->st.frsize; /* cast from uint32_t to uint64_t */
695
696 fdisp_destroy(&fdi);
697 return 0;
698
699 fake:
700 sbp->f_blocks = 0;
701 sbp->f_bfree = 0;
702 sbp->f_bavail = 0;
703 sbp->f_files = 0;
704 sbp->f_ffree = 0;
705 sbp->f_namemax = 0;
706 sbp->f_bsize = S_BLKSIZE;
707
708 return 0;
709 }
710